//
//  NSDate+MJ.m
//  OCKSFWeibo
//
//  Created by 盛 发 况 on 16/4/21.
//  Copyright © 2016年 盛 发 况. All rights reserved.
//

#import "NSDate+MJ.h"

@implementation NSDate (MJ)
/**
 *  是否为今天
 */
- (BOOL)isToday {
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    int unit = NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear;
    
    // 1.获得当前时间的年月日
    NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];
    
    // 2.获得self的年月日
    NSDateComponents *selfCmps = [calendar components:unit fromDate:self];
    
    return (selfCmps.year == nowCmps.year) && (selfCmps.month == nowCmps.month) && (selfCmps.day == nowCmps.day);
    
}
/**
 *  是否为昨天
 */
- (BOOL)isYesterday {
    
    // 2014-05-01
    NSDate *nowDate = [[NSDate date] dateWithYMD];
    
    // 2014-04-30
    NSDate *selfDate = [self dateWithYMD];
    
    // 获得nowDate和selfDate的差距
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *cmps = [calendar components:NSCalendarUnitDay fromDate:selfDate toDate:nowDate options:0];
    return cmps.day == 1;
    
}

/**
 *  返回一个只有年月日的时间
 */
- (NSDate *)dateWithYMD {
    
    NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
    fmt.dateFormat = @"yyyy-MM-dd";
    NSString *selfStr = [fmt stringFromDate:self];
    return [fmt dateFromString:selfStr];
}
/**
 *  是否为今年
 */
- (BOOL)isThisYear {

    NSCalendar *calendar = [NSCalendar currentCalendar];
    int unit = NSCalendarUnitYear;
  
    // 1.获得当前时间的年月日
    NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];
    // 2.获得self的年月日
    NSDateComponents *selfCmps = [calendar components:unit fromDate:self];
    
    return nowCmps.year = selfCmps.year;
}

/**
 *  获得与当前时间的差距
 */
- (NSDateComponents *)deltaWithNow {

    NSCalendar *calendar = [NSCalendar currentCalendar];
    int unit = NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear;
    
    return [calendar components:unit fromDate:self toDate:[NSDate date] options:0];
}

@end




